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ICS84320AK-01LF Datasheet(PDF) 10 Page - Integrated Device Technology |
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ICS84320AK-01LF Datasheet(HTML) 10 Page - Integrated Device Technology |
10 / 21 page 84320AY-01 10 REV. C OCTOBER 22, 2007 ICS84320-01 780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER CRYSTAL INPUT INTERFACE A crystal can be characterized for either series or parallel mode operation.The ICS84320-01 has a built-in crystal oscillator circuit. This interface can accept either a series or parallel crystal without additional components and generate frequencies with accuracy FIGURE 3. CRYSTAL INPUt INTERFACE suitable for most applications. Additional accuracy can be achieved by adding two small capacitors C1 and C2 as shown in Figure 3. C2 22p C1 18p X1 18pF Parallel Crystal ICS84320-01 25 24 XTAL1 XTAL2 LVCMOS TO XTAL INTERFACE The XTAL_IN input can accept a single-ended LVCMOS signal through an AC coupling capacitor. A general interface diagram is shown in Figure 4. The XTAL_OUT pin can be left floating. The input edge rate can be as slow as 10ns. For LVCMOS inputs, it is recommended that the amplitude be reduced from full swing to half swing in order to prevent signal interference with the power rail and to reduce noise. This configuration requires that the output impedance of the driver (Ro) plus the FIGURE 4. GENERAL DIAGRAM FOR LVCMOS DRIVER TO XTAL INPUT INTERFACE series resistance (Rs) equals the transmission line impedance. In addition, matched termination at the crystal input will attenuate the signal in half. This can be done in one of two ways. First, R1 and R2 in parallel should equal the transmission line impedance. For most 50 Ω applications, R1 and R2 can be 100 Ω. This can also be accomplished by removing R1 and making R2 50 Ω. XTAL_IN XTAL_OUT Ro Rs Zo = Ro + Rs 50 Ω 0.1µf R1 R2 VDD VDD |
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